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    <title>Document</title>
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    <div id="app">
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        /*
            computed会基于他们的依赖产生缓存，只有当依赖发生变化的时候才会重新求值
        */ 
        let app = new Vue({
            el: '#app',
            data() {
                return {

                }
            },
            computed:{
                
            }
        });
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